LOL Shield – Heartbeat

I am doing a heartbeat with LOL shield, the heartbeat will display from bottom to the top.  At first I have tried to use with pulse sensor but I could not do it. So the heartbeat will beat according to delay command.



#include <avr/pgmspace.h> //AVR library for writing to ROM

#include <Charliplexing.h> //Imports the library, which needs to be
//Initialized in setup.

int blinkdelay = 500; //Sets the time each frame is shown

The BitMap array is what contains the frame data. Each line is one full frame.
Since each number is 16 bits, we can easily fit all 14 LEDs per row into it.
The number is calculated by adding up all the bits, starting with lowest on
the left of each row. 18000 was chosen as the kill number, so make sure that
is at the end of the matrix, or the program will continue to read into memory.

Here PROGMEM is called, which stores the array into ROM, which leaves us
with our RAM. You cannot change the array during run-time, only when you
upload to the Arduino. You will need to pull it out of ROM, which is covered
below. If you want it to stay in RAM, just delete PROGMEM
uint16_t BitMap[][9] PROGMEM = {
//Diaganal swipe across the screen


void setup() {
LedSign::Init(); //Initializes the screen
void loop() {
DisplayBitMap(); //Displays the bitmap

void DisplayBitMap()
boolean run=true; //While this is true, the screen updates
byte frame = 0; //Frame counter
byte line = 0; //Row counter
unsigned long data; //Temporary storage of the row data

while(run == true) {
for(line = 0; line < 9; line++) {

//Here we fetch data from program memory with a pointer.
data = pgm_read_word_near (&BitMap[frame][line]);

//Kills the loop if the kill number is found
if (data==18000){

//This is where the bit-shifting happens to pull out
//each LED from a row. If the bit is 1, then the LED
//is turned on, otherwise it is turned off.
else for (byte led=0; led<14; ++led) {
if (data & (1<<led)) {
LedSign::Set(led, line, 1);
else {
LedSign::Set(led, line, 0);


//Delays the next update

Leave a Reply

Your email address will not be published.